Photonics Dictionary

gallium arsenide phosphide

Gallium arsenide phosphide (GaAsP) is a semiconductor alloy composed of gallium (Ga), arsenic (As), and phosphorus (P). It is commonly used in the fabrication of optoelectronic devices, particularly light-emitting diodes (LEDs) and semiconductor lasers. GaAsP is a ternary compound, meaning it consists of three elements.

Key points about GaAsP:

Composition: GaAsP is formed by combining gallium (Ga) from Group III, arsenic (As) from Group V, and phosphorus (P) from Group V of the periodic table.

Ternary alloy: As a ternary alloy, GaAsP is part of the III-V semiconductor family, which includes various compound semiconductors formed by combining elements from Group III and Group V.

Bandgap engineering: The composition of GaAsP can be adjusted to achieve specific optical and electronic properties. By varying the ratio of gallium, arsenic, and phosphorus, the bandgap of GaAsP can be tailored to emit light at different wavelengths.

Optoelectronic applications: GaAsP is widely used in the production of light-emitting diodes (LEDs) and semiconductor lasers, particularly in the visible and near-infrared regions of the electromagnetic spectrum. It is employed in various applications, including displays, indicator lights, and optical communication systems.

Direct bandgap semiconductor: GaAsP, like GaAs, is a direct bandgap semiconductor. This property is important for efficient light emission in optoelectronic devices.

Growth techniques: GaAsP can be grown using various epitaxial growth techniques, such as metalorganic vapor phase epitaxy (MOVPE) or molecular beam epitaxy (MBE), to produce high-quality crystalline structures.

The ability to tune the bandgap of GaAsP makes it suitable for producing a range of colors in LEDs, and it has been historically used in red, orange, and yellow LEDs. While other semiconductor materials, such as gallium nitride (GaN) based materials, have gained prominence in certain LED applications, GaAsP remains important in specific wavelength ranges and for certain optoelectronic applications.

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